<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>记事本</title>
</head>
<body>
    <section id="todoapp">
        <header>
            <h1>记事本</h1>
            <input v-model="inputValue" @keyup.enter="add" autofocus="autofocus" autocomplete="off" placeholder="请输入任务">
        </header>
        <section>
            <ul>
                <li v-for="(item,index) in list">
                    <div>
                        <span>{{index+1}}.</span>
                        <label>{{item}}</label>
                        <button @click="remove(index)">delect</button>
                    </div>
                </li>
            </ul>
        </section>
        <footer v-show="list.length!=0">
            <span>
                <strong>{{list.length}}</strong> items left
            </span>
            <button @click="clear">Clear</button>
        </footer>
    </section>
    <footer></footer>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app=new Vue({
            el:"#todoapp",
            data:{
                list:["写代码","睡觉觉","吃饭饭"],
                inputValue:"好好学习，天天向上"
            },
            methods:{
                add:function(){
                    this.list.push(this.inputValue);
                },
                remove:function(index){
                    this.list.splice(index,1);
                },
                clear:function(){
                    this.list=[];
                }
            }
        })
    </script>
</body>
</html>